Depending on the condition, "complete-ness" of the car and how much Zs are going for in your area, a $1000-$3000 is probably in order.
Still going to have the cost of the clip, which is like going to be $2500-$3000 at least. Provided it's in good shape and you don't have to buy too many replacement parts you could skate away for $5000 or less doing the work yourself.
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1989 240SX Fastback. . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 300ZX Twin Turbo
Warning: Objects in mirror aren't as fast as they thought they were.